Note: When you answer questions involving the test of hypotheses, use the four-step hypothesis process (see textbook pages 298-299).

Also, see your textbook for the full question when necessary; the chapter 9 problems start on p. 303

Chapter 9, problems 4, 12, 14, 22

4.Explain why t distributions tend to be flatter and more spread out than the normal distribution.

12.Last fall, a sample of n = 36 freshmen was selected to participate in a new 4-hour training program designed to improve study skills…: = 74; M = 79.4, s = 18.

a.On the basis of these data, can the college conclude that the students in the new program performed significantly better than the rest of the freshman class? Use a one-tailed test with = .05.

b.Can the college conclude that the students in the new program are significantly different from the rest of the freshman class? Use a two-tailed test with = .05.

14.In the Preview for this chapter, we discussed a study that examined the effect of eye spot patterns on the behavior of moth eating birds: = 30; M = 37, SS = 288, n = 9.

a.Is this sample sufficient to conclude that the eye-spots have a significant influence on the birds’ behavior? Use a two-tailed test with = .05.

b.Compute the estimated Cohen’s d to measure the size of the treatment effect.

22.A researcher would like to examine the effects of humidity on eating behavior. It is known that laboratory rats normally eat an average of = 21 grams of food each day. The researcher selects a random sample of n = 16 rats and places them in a controlled atmosphere room in which the relative humidity is maintained at 90%. The daily food consumption scores for the rats are as follows:

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Contents
Question 1 3
Question 2a 5
Question 2b 6
Question 2c 7
Question 3a 8
Question 3b 8
Question 3c 10
Question 3d 11
Question 4 12
Question 5 14
References 15
Question 1
The sampling method that Mr. Kwok is using is Stratified Random Sampling Method. In this case study, Mr Kwok collected a random sample of 1000 flights and proportions of three routes in the sample. He divides them into...

...Trajico, Maria Liticia D.
BSEd III-A2
REFLECTION
The first thing that puffs in my mind when I heard the word STATISTIC is that it was a very hard subject because it is another branch of mathematics that will make my head or brain bleed of thinking of how I will handle it. I have learned that statistic is a branch of mathematics concerned with the study of information that is expressed in numbers, for example information about the number of times...

...Technology in Patient Care. In M.A. Papadakis, S.J. McPhee, M.W. Rabow, T.G. Berger (Eds), CURRENT Medical Diagnosis & Treatment 2014. Retrieved November 11, 2013 from http://www.accessmedicine.com/content.aspx?aID=779189
As you read the lessons this week consider the languages that you might be most familiar with and consider if these add a meaningful definition to what you do on a day to day basis. Consider as well some of the different terminologies out there in your...

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EXAM 3
Alice Cline
PSY325: Statistics for the Behavioral and Social Sciences
Instructor Jeral Kirwan
April 7, 2014
INTRODUCTION
In 2012, the presidential election was in the spotlight as a result of power statistics when the founder of the FiveThirtyEight blog Nate Silver; prophesized the results of 50 states by using a statistical model of polling information. Nate Silver then wrote his best-selling book stressing the importance of statistical...

...shorter than TT Air, it does not significantly affect the output as the one day does not change much (unless there had been a market shock). However based on Central Limit Theorem, if the sample size is greater than or equal to 30 samples, the sample statistics reflect the time population parameters.
• The Median data does not show much in this case as the range (4.7 AA Fly and 6.8 TT Air) is small for both AA Fly and TT Air. This means that the mean is more applicable to be...

...indicated to what kind of test was going to be used and since I claimed that the rural area were going to have a lower average number of beds it states that the shaded area on the critical value test will be less than zero.
Table 1. Descriptive statistics for the given null and alternative hypothesis that includes the sample, mean, median, standard deviation, maximum values, and minimum values.
Sample Size
Mean
Median
Standard Deviation
Maximum Value
Minimum Value
Rural Area...

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Final Project: Nyke Shoe Company
Barbara Greczyn
STA 201 - Principles of Statistics
Instructor Alok Dihtal
April 26, 2015
Introduction
Nyke Shoe Company has been in business for over 50 years. Over the last five years, the company has been undergoing some financial hardship due to an erratic market and an inability to understand what the consumer actually needs. In a last ditch effort to avoid bankruptcy, they have adopted a new business model...

...Ch. 7 Pr. 1
For a population containing N=902 individuals, what code number would you assign for;
a. The first person on the list= 001
b. The fortieth person on the list= 040
c. The last person on the list= 902
Ch. 7 Pr. 13
What additional information would you want to know about the survey before you accepted the results of the study?
-Why was the study conducted? –What was the margin of error? –What was the sample size? -What sampling design was...